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liubo4ka [24]
3 years ago
13

Help pls its a test t t t t t t

Mathematics
2 answers:
andrew-mc [135]3 years ago
8 0

Answer: C

Step-by-step explanation: Hope this help :D

Ray Of Light [21]3 years ago
6 0
The answer is c because it is c
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The 99% confidence interval for the proportion of all students at this school who have their names written on their graphing calculators is (0.4652, 0.8148).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

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99% confidence level

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The lower limit of this interval is:

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The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.64 + 2.575\sqrt{\frac{0.64*0.36}{50}} = 0.8148

The 99% confidence interval for the proportion of all students at this school who have their names written on their graphing calculators is (0.4652, 0.8148).

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